Synthesis of (±)-thienamycin based on a new approach to β-lactams via 4-exo-trig cyclisation of carbamoylcobalt salophens
作者:Gerald Pattenden、Stephen J. Reynolds
DOI:10.1039/p19940000379
日期:——
been shown to be useful precursors in a new approach to β-lactams (viz.12-16, 21 and 31), via 4-exo-trig modes of cyclisation of the corresponding intermediate carbamoyl radicals. A new formalsynthesis of (±)-thienamycin 1 from the trans-disubstituted azetidin-2-one 31 produced in one step by heating the carbamoylcobalt salophen 30 in toluene, is also described.